HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Bilbao

$326+ Cheap flights from Seattle (SEA) to Bilbao (BIO)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/23. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BIO
Apr 2 — Apr 91
Wed 4/2
Wed 4/9
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Seattle to Bilbao with Cheapflights

1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”
2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.
3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Seattle to Bilbao

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Bilbao (BIO). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated March 28, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$814
(Mytrip)

One-way from

$338
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$1,075
Provider with most accurate pricing for Seattle/Tacoma Intl-Bilbao flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Bilbao flights.
Search Deals
From Seattle/Tacoma Intl to Bilbao
Search Deals
One-way flight from Seattle/Tacoma Intl to Bilbao
Search Deals
Highest demand for flights based on searches. 17% potential increase in price ($250 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($36 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2025
Search Deals

Find flight deals from Seattle to Bilbao

Cheapest flights from Seattle to Bilbao
Explore the most affordable flight options available from Seattle to Bilbao. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 28, 2025.

This Mytrip deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/143:45 pmSEA - BIO
3 stops31h 30mMultiple Airlines
Wed 5/219:05 pmBIO - SEA
3 stops29h 45mMultiple Airlines
Deal found 3/26$658
This Finnair deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/191:32 pmSEA - BIO
2 stops24h 43mFinnair
Thu 8/286:45 amBIO - SEA
2 stops26h 59mFinnair
Deal found 3/26$839
This KAYAK deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/126:50 pmSEA - BIO
1 stop14h 00mLufthansa
Mon 9/227:10 pmBIO - SEA
2 stops36h 06mLufthansa
Deal found 3/27$949
This United Airlines deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1211:54 pmSEA - BIO
2 stops25h 51mUnited Airlines
Mon 9/222:10 pmBIO - SEA
1 stop30h 45mUnited Airlines
Deal found 3/27$951
This Delta deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/298:15 amSEA - BIO
2 stops17h 10mDelta
Fri 5/306:50 amBIO - SEA
1 stop18h 07mDelta
Deal found 3/27$970
This Gurufare deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/146:45 pmSEA - BIO
1 stop13h 45mAer Lingus
Wed 5/216:10 pmBIO - SEA
1 stop31h 49mAer Lingus
Deal found 3/26$976
This FlightHub deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/147:10 pmSEA - BIO
1 stop30h 55mTurkish Airlines
Wed 5/286:25 pmBIO - SEA
1 stop31h 50mTurkish Airlines
Deal found 3/26$989
This AranGrant deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure AranGrant is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/51:35 pmSEA - BIO
2 stops38h 10mIberia
Sat 4/121:30 pmBIO - SEA
2 stops31h 00mIberia
Deal found 3/27$2,909
This TAP AIR PORTUGAL deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure TAP AIR PORTUGAL is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/1411:30 amSEA - BIO
2 stops21h 30mTAP AIR PORTUGAL
Wed 7/3012:25 pmBIO - SEA
3 stops30h 55mTAP AIR PORTUGAL
Deal found 3/25$2,967
This KLM deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/52:10 pmSEA - BIO
1 stop17h 20mKLM
Sat 4/1212:00 pmBIO - SEA
1 stop32h 45mKLM
Deal found 3/27$4,228

Cheapflights Fare Finder

Customize your flight search to find flights from Seattle to Bilbao that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated March 28, 2025.
Use the filters below to find and compare flights from Seattle to Bilbao that are best for you.

Fly from

Seattle

Fly to

Bilbao

Route

Depart

Return

Price

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Wed 5/14

3:45 pm-8:15 am

3 stops31h 30m

Bilbao

Wed 5/21

9:05 pm-5:50 pm

3 stops29h 45m

$658

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Tue 4/29

8:15 am-10:25 am

2 stops17h 10m

Bilbao

Fri 5/30

6:50 am-3:57 pm

1 stop18h 07m

$970

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Wed 5/14

6:45 pm-5:30 pm

1 stop13h 45m

Bilbao

Wed 5/21

6:10 pm-4:59 pm

1 stop31h 49m

$976

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Wed 5/14

7:10 pm-11:05 am

1 stop30h 55m

Bilbao

Wed 5/28

6:25 pm-5:15 pm

1 stop31h 50m

$989

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Wed 4/23

6:50 pm-5:50 pm

1 stop14h 00m

Bilbao

Wed 4/30

6:45 am-10:51 am

2 stops37h 06m

$1,052

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Sat 4/5

1:35 pm-12:45 pm

2 stops38h 10m

Bilbao

Sat 4/12

1:30 pm-11:30 am

2 stops31h 00m

$2,909

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Sat 4/5

3:05 pm-5:50 pm

2 stops17h 45m

Bilbao

Sat 4/12

2:10 pm-12:25 pm

1 stop31h 15m

$3,433

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Sat 4/5

2:10 pm-4:30 pm

1 stop17h 20m

Bilbao

Sat 4/12

12:00 pm-11:45 am

1 stop32h 45m

$4,228

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Wed 4/23

7:00 pm-9:10 am

3 stops53h 10m

$326

SeattleBilbao

SEA - BIO

SEABIO

Seattle/Tacoma Intl

Sat 6/14

6:45 pm-5:30 pm

1 stop13h 45m

$706

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/26

Showing 1-10 of 11 results
1
2

Compare providers for flights from Seattle to Bilbao

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Seattle to Bilbao in March.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Seattle-Bilbao flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-Bilbao flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Seattle-Bilbao flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Seattle-Bilbao flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seattle-Bilbao flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Seattle to Bilbao

Have a flexible travel schedule? Discover the best time to fly to Bilbao from Seattle with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Seattle to Bilbao

What is the cheapest month to book a flight from Seattle to Bilbao?

Currently, January is the cheapest month in which you can book a flight from Seattle to Bilbao (average of $541). Flying from Seattle to Bilbao in June is currently the most expensive (average of $1,178). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from SEA to BIO?

Find hourly flight availability from Seattle to Bilbao. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated March 28, 2025.

It’s optimal to fly from Seattle to Bilbao in the morning. By choosing this option you can save up to 43% on the cost of your flight, compared to a flight at noon.

Rainfall in Bilbao by month

Plan your trip to Bilbao by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Bilbao ranges from 2.4 - 5.6 inches per month. November is typically the wettest month, when rainfall can reach 5.6 in. July is typically the driest time to visit Bilbao when rainfall is around 2.4 in.

Temperature in Bilbao by month

Plan your trip to Bilbao by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Bilbao, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 68.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 48.2 F).

Reviews of airlines servicing Bilbao

Get insights into the airlines that provide service to Bilbao. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Bilbao. Reviews last updated March 28, 2025.
To help decide which airline to fly from Seattle to Bilbao, see what other customers have to say about Delta, KLM and SWISS. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,896 reviews

Boarding

8.2

Food

7.3

Crew

8.5

Entertainment

7.9

Comfort

8.0

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
8.0
Very good
7,896 reviews
Delta
8.0
Very good
7,896 reviews

Boarding

8.2

Food

7.3

Crew

8.5

Entertainment

7.9

Comfort

8.0

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
KLM
7.8
Good
1,321 reviews
Delta
8.0
Very good
7,896 reviews

Boarding

8.2

Food

7.3

Crew

8.5

Entertainment

7.9

Comfort

8.0

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
SWISS
7.5
Good
1,570 reviews
Delta
8.0
Very good
7,896 reviews

Boarding

8.2

Food

7.3

Crew

8.5

Entertainment

7.9

Comfort

8.0

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Air France
7.4
Good
1,424 reviews
Delta
8.0
Very good
7,896 reviews

Boarding

8.2

Food

7.3

Crew

8.5

Entertainment

7.9

Comfort

8.0

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
United Airlines
7.4
Good
8,603 reviews
Delta
8.0
Very good
7,896 reviews

Boarding

8.2

Food

7.3

Crew

8.5

Entertainment

7.9

Comfort

8.0

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Bilbao. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What are the cheapest airlines flying from Seattle to Bilbao round-trip?

    Cheapflights users have booked flights from Seattle to Bilbao round-trip from $949. Other airlines that can offer you cheap pricing are United Airlines, from $951, and Delta, from $970. Lufthansa is 17% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the cheapest airlines to fly from Seattle to Bilbao one-way?

    The cheapest airlines for a one-way flight from Seattle to Bilbao are Aer Lingus ($684), Air France ($741), and United Airlines ($749).

  • Can I find deals for flights from Seattle to Bilbao that include hotel bookings?

    Yes. In addition to deals on Seattle to Bilbao flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Bilbao?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Bilbao.

  • Can I find deals for business class flights from Seattle to Bilbao?

    Yes. Cheapflights offers flight deals from Seattle to Bilbao by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Seattle to Bilbao?

    Currently, January is the cheapest month in which you can book a flight from Seattle to Bilbao (average of $541). Flying from Seattle to Bilbao in June is currently the most expensive (average of $1,178). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Seattle to Bilbao

See prices for flight routes from nearby airports that may be better suited for you.
Seattle to San Sebastian flights
Portland to Bilbao flights
Pasco to Bilbao flights

Top 4 airlines flying from Seattle to Bilbao

Discover the top 4 airlines that operate flights from Seattle to Bilbao. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated March 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest$672Average$1,212FlexibilityNo cancel feeOn-time76%
Air FranceCheapest$675Average$928FlexibilityNo cancel feeOn-time77%
DeltaCheapest$757Average$1,185FlexibilityNo cancel feeOn-timeN/A
KLMCheapest$765Average$1,075FlexibilityNo cancel feeOn-time75%
100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.